Fan structure and handheld fan with hidden fan blades

Abstract

The invention provides a fan structure which is suitable for a handheld fan and comprises a support, a brushless motor assembly and a fan blade assembly, the brushless motor assembly and the fan blade assembly are installed in the support, a fixing part used for installing a brushless motor set is arranged in the support, and the brushless motor assembly is installed on the fixing part. The brushless motor assembly is sleeved with the fan blade assembly, and the fan blade assembly is connected with the fixing part so that the fan blade assembly, the support and the brushless motor assembly can form an integrated structure. A mounting groove for mounting a battery is formed in the end, away from the fan blade assembly, of the support, a flow guide assembly is further arranged in the support, and the flow guide assembly and the fan blade assembly are arranged at preset intervals. The invention provides a handheld fan with hidden fan blades. According to the hidden fan blade type handheld fan, the air duct area can be effectively increased, the air inlet amount is increased, noise can be reduced, the overall air outlet amount is increased, and the user experience feeling is better.

Description

Technical Field

[0001] The present invention relates to the technical field of handheld fans, and in particular to a fan structure and a hidden-blade handheld fan. Background Art

[0002] Existing handheld fans with hidden blades hide the blades inside the handle, blowing air upwards. The airflow direction is changed 90 degrees by the air outlet head structure, forming an airflow that blows directly towards the human body at the air outlet. The air inlet can be at the upper end of the handle or at the lower end of the handle. However, regardless of whether the air inlet is at the upper or lower end of the handle, the noise is relatively high. In addition, when the air inlet is at the upper end of the handle, an air inlet hole needs to be opened at the upper part of the handle. The air inlet is generally in the shape of a grille. In order to maintain the strength of the handle, the opening ratio is too low, which easily leads to low air intake and, in turn, low air output. Secondly, when the air inlet is at the upper end of the handle, the user will block part of the air inlet when holding it, affecting the air volume. When the air inlet is at the lower end of the handle, the motor, battery, PCBA, button charging port and other structural parts need to be placed in the air duct. However, the resistance in the air duct is too large, resulting in high noise and low air volume.

[0003] Therefore, it is necessary to provide a hidden blade handheld fan that can increase the air duct area, increase the air intake volume, reduce noise and increase the overall air output volume. Summary of the Invention

[0004] The object of the present invention is to provide a fan structure that can increase the air duct area to reduce noise and increase the overall air output.

[0005] Another object of the present invention is to provide a hidden blade handheld fan that can increase the air duct area, increase the air intake volume, reduce noise and increase the overall air output volume.

[0006] To achieve the above-mentioned objectives, the present invention provides a fan structure suitable for a handheld fan, comprising a bracket and a brushless motor assembly and a fan blade assembly installed in the bracket, a fixing portion for installing the brushless motor group is provided in the bracket, the brushless motor assembly is installed on the fixing portion, the fan blade assembly is sleeved on the brushless motor assembly and connected to the fixing portion to form an integrated structure with the bracket and the brushless motor assembly; an end of the bracket away from the fan blade assembly is provided with a mounting groove for installing a battery, and a guide assembly is also provided in the bracket, and the guide assembly and the fan blade assembly are arranged at a preset interval.

[0007] Preferably, the preset interval is between 1.5 mm and 2.5 mm.

[0008] Preferably, the brushless motor assembly, the fan blade assembly and the flow guide assembly are coaxially arranged.

[0009] Preferably, the fan blade assembly includes a fixing member sleeved on the brushless motor assembly, the fan blades on the fan blade assembly are arranged on the fixing member, and the outer diameter of the mounting groove is not greater than the outer diameter of the fixing member.

[0010] Preferably, the fan blade assembly includes a plurality of fan blades, and the guide assembly includes a plurality of guide blades, and the spiral directions of the fan blades and the guide blades are opposite.

[0011] Preferably, the gap between the fan blades and the inner wall of the bracket is less than or equal to 1 mm.

[0012] Compared with the prior art, the fan structure of the present invention is suitable for a handheld fan. The fan structure includes a bracket and a brushless motor assembly and a fan blade assembly installed in the bracket. An end of the bracket away from the fan blade assembly is provided with a mounting slot for installing a battery, and the battery is a cylindrical battery. The fan assembly also includes a circuit assembly, and the circuit assembly is fixed on the cylindrical battery. The fan blade assembly, the brushless motor assembly, the bracket, the battery and the circuit assembly are an integrated structure. The preset interval between the guide assembly and the fan blade assembly is between 1.5 mm and 2.5 mm, which can effectively reduce the fan blade noise and increase the air volume at the same time. The fan assembly is an integrated structure, which effectively integrates the various components of the fan structure, so that the air duct area is larger and the wind resistance is smaller.

[0013] To achieve the other purpose mentioned above, the present invention provides a hidden-blade handheld fan, comprising a housing and the above-mentioned fan structure, wherein the fan structure is installed in the housing, and the outer surface of the fan structure and the inner surface of the housing constitute an air duct for supplying air.

[0014] Preferably, it further comprises a circuit assembly and a fixing frame, wherein the circuit assembly abuts against the battery, and the fixing frame is sleeved on the circuit assembly and installed on the end of the battery, so that the circuit assembly and the battery form an integrated structure by means of the fixing frame.

[0015] Preferably, the circuit assembly includes a circuit board located in a fixing frame and a first protrusion and a second protrusion protruding from the fixing frame, the first protrusion is connected to a button, and the second protrusion is connected to a charging interface, and the button and the charging interface are partially exposed outside the shell, and the first protrusion and the second protrusion cooperate with the shell to strengthen the installation of the circuit assembly and the battery in the shell.

[0016] Preferably, grooves for positioning and installing the circuit assembly are formed on both sides of the fixing frame. The circuit assembly is fixed in the grooves, and the first and second protrusions protrude out of the fixing frame through the grooves.

[0017] Preferably, a first snap-fitting portion cooperating with the outer shell is provided on both sides of the fixing frame, the first snap-fitting portion and the first protrusion or the second protrusion are overlapped together in the air duct along the length direction of the air duct, and a second snap-fitting portion cooperating with the first snap-fitting portion is provided on the outer shell, and the connection between the fan structure and the outer shell is reinforced by the cooperation of the first snap-fitting portion and the second snap-fitting portion.

[0018] Preferably, a mounting portion cooperating with the bracket is provided in the housing, the mounting portion is recessed into the inner wall of the housing, the bracket is installed in the mounting portion, and the mounting portion is used to reinforce the installation of the fan structure in the housing.

[0019] Preferably, an air inlet assembly is provided at the end of the outer shell near the bracket, and the air inlet assembly includes an air inlet cover detachably mounted on the outer shell, and a plurality of first air inlets are provided on the air inlet cover, and the plurality of first air inlets are in a grille shape, and the ratio of the height of the first air inlet to the length of the fan blade in the fan blade assembly is greater than or equal to 0.9.

[0020] Preferably, the minimum distance between the end of the first air inlet close to the fan blade assembly and the fan blade assembly is greater than or equal to 5 mm.

[0021] Preferably, an annular air outlet is provided at the end of the shell away from the bracket, and the fan blade assembly includes a fixing part and a plurality of fan blades arranged on the fixing part. When the fan blades rotate, they form an annular air supply area with the fixing part, and the ratio between the area of ​​the air outlet and the air supply area ranges from 1:3 to 1:2.

[0022] Preferably, a plurality of boost guide vanes are provided in the air outlet, and the plurality of boost guide vanes divide the air outlet into a plurality of air outlet portions evenly and equidistantly.

[0023] Compared to the prior art, the present invention's concealed-blade handheld fan forms an air duct with the fan structure and housing. Because the fan structure effectively integrates various components, the air duct area is larger and wind resistance is reduced. The circuit assembly is secured to the battery via a mounting bracket, with the circuit assembly partially located within the bracket, reducing resistance to the air duct. The portion of the circuit assembly protruding from the housing provides auxiliary support, making the overall structure more stable. In the fan structure, the preset spacing between the guide assembly and the blade assembly ranges from 1.5 mm to 2.5 mm, effectively reducing blade noise while increasing air volume. Furthermore, the ratio of the height of the first air inlet to the length of the blades in the blade assembly is greater than or equal to 0.9, ensuring a sufficiently large air intake. The minimum distance between the end of the first air inlet closest to the blade assembly and the blade assembly is greater than or equal to 5 mm, further reducing noise. The ratio between the outlet area and the air supply area ranges from 1:3 to 1:2 to effectively compress the air and increase air pressure. Several booster guide vanes are provided within the outlet to increase air pressure and extend the air supply distance. The hidden blade handheld fan of the present invention can effectively increase the air duct area, increase the air intake volume, reduce noise and increase the overall air output volume, thereby providing a better user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 It is a structural diagram of a hidden-blade handheld fan provided by one embodiment of the present invention.

[0026] Figure 2 yes Figure 1 Structural breakdown diagram.

[0027] Figure 3 yes Figure 1 Structural diagram from another angle.

[0028] Figure 4 yes Figure 1 sectional view of .

[0029] Figure 5 yes Figure 1 Cross-sectional view from another angle.

[0030] Figure 6 yes Figure 1 Structural diagram of the blower structure.

[0031] Figure 7 yes Figure 6 sectional view of .

[0032] Figure 8 yes Figure 6 Structural diagram of the middle bracket.

[0033] Figure 9 yes Figure 8 Structural diagram from another angle.

[0034] Figure 10 yes Figure 6 Structural diagram of the middle fan blade assembly.

[0035] Figure 11 yes Figure 2 Structural diagram of the first shell.

[0036] Figure 12 yes Figure 2 Structural diagram of the second shell.

[0037] Figure 13 yes Figure 6 Structural diagram of the circuit board.

[0038] Figure 14 yes Figure 6 Structural diagram of the middle fixing bracket.

[0039] Description of reference numerals:

[0040] 100. Hidden blade handheld fan; 101. Air duct; 102. Air outlet;

[0041] 10. Fan structure; 11. Bracket; 111. Air guide assembly; 112. Mounting slot; 113. Fixing portion; 114. Hollow cavity; 12. Brushless motor assembly; 121. Cover; 122. First mounting hole; 13. Blade assembly; 131. Fan blade; 132. Fitting portion; 133. Fixing member; 134. Second mounting hole; 14. Connecting assembly; 20. Housing; 201. Mounting portion; 202. Fitting portion; 203. Second engaging portion; 21. First housing; 211. Boost guide vane; 212. Clamping protrusion; 22. Second housing; 221. Clamping hole; 23. Air inlet assembly; 231. Air inlet cover; 232. First air inlet; 233. Second air inlet; 24. Fixing ring;

[0042] 30. Electrical structure; 31. Battery; 32. Circuit assembly; 321. Button; 322. Charging port; 323. Circuit board; 324. First protrusion; 325. Second protrusion; 33. Fixing frame; 331. First engaging portion; 332. Accommodating cavity; 333. Slot body. DETAILED DESCRIPTION

[0043] In order to explain the technical content and structural features of the present invention in detail, the following is a further description in conjunction with the embodiments and the accompanying drawings.

[0044] See also Figures 1 to 5The present invention provides a hidden blade handheld fan 100, comprising a housing 20 and a fan structure 10 installed in the housing 20, wherein the outer surface of the fan structure 10 and the inner surface of the housing 20 form an air duct 101 for supplying air. The fan structure 10 in the present invention is suitable for a handheld fan. The fan structure 10 comprises a bracket 11 and a brushless motor assembly 12 and a fan blade assembly 13 installed in the bracket 11. A hollow cavity 114 for accommodating the brushless motor assembly 12 and the fan blade assembly 13 is provided in the bracket 11, and a fixing portion 113 for mounting the brushless motor assembly 12 is provided in the hollow cavity 114. The fixing portion 113 can be a protruding columnar structure. For example, the brushless motor assembly 12 is sleeved and mounted on the fixing portion 113, and the fan blade assembly 13 is sleeved on the outer surface of the brushless motor assembly 12 and is internally connected to the fixing portion 113. As a result, the bracket 11, the brushless motor assembly 12 and the fan blade assembly 13 form an integrated structure with a reasonable and compact layout. On the other hand, an electrical structure 30 is also provided in the air duct 101. The electrical structure 30 includes a battery 31, a circuit assembly 32 and a fixing bracket 33. A mounting groove 112 for mounting a cylindrical battery 31 is provided at one end of the bracket 11 away from the fan blade assembly 13. The mounting groove 112 is used to mount the cylindrical battery 31. The slender cylindrical structure of the cylindrical battery 31 is more conducive to the formation of a smooth air duct 101, and can make the area of ​​the air duct 101 larger and the wind resistance smaller. The cylindrical battery 31 is installed in the mounting groove 112, and the circuit assembly 32 cooperates with the fixing bracket 33 to be installed at the other end of the cylindrical battery 31. In the air duct 101, the fan structure 10 and the electrical structure 30 are arranged as an integral whole, with a compact and reasonable structure. The fan structure 10 and the electrical structure 30 cooperate to maximize the entire air duct 101 and make the wind resistance as small as possible.

[0045] See also Figures 6 to 10 In some optional embodiments, a guide assembly 111 is further provided in the bracket 11, and the guide assembly 111 and the fan blade assembly 13 are arranged at a preset interval. Among them, the fan blade assembly 13 includes a plurality of fan blades 131, and the guide assembly 111 includes a plurality of guide blades. The fan blades 131 and the guide blades have opposite spiral directions to avoid resonance and reduce noise. At the same time, the fan blades 131 and the guide blades have opposite spiral directions, which can inhale more gas in the flow channel and increase wind force. Exemplarily, the preset interval between the guide assembly 111 and the fan blade assembly 13 is between 1.5 mm and 2.5 mm. The distance between the guide assembly 111 and the fan blade assembly 13 is set between 1.5 mm and 2.5 mm, which can effectively reduce the noise of the fan blades while increasing the air volume as much as possible. It can be understood that when the fan structure 10 is started, a circulation will be generated between the guide component 111 and the fan blade component 13 to form pressure potential energy. The distance between the guide component 111 and the fan blade component 13 is between 1.5 mm and 2.5 mm, which can make the pressure potential energy greater and the air supply force stronger.

[0046] See also Figure 4 or Figure 7 In some optional embodiments, the brushless motor assembly 12, the fan blade assembly 13, and the air guide assembly 111 are coaxially arranged. The coaxial arrangement of the brushless motor assembly 12, the fan blade assembly 13, and the air guide assembly 111 allows the entire fan structure 10 to be centrally installed within the housing 20, thereby making the entire air duct 101 more neat and symmetrical. The spaces in each area of ​​the air duct 101 are roughly the same, thereby enabling better air supply, uniform air output, and a better wind experience.

[0047] See also Figures 6 to 10 In some optional embodiments, the fan blade assembly 13 is connected to the brushless motor assembly 12 through the connecting assembly 14, and the fan blade assembly 13 rotates with the rotation of the brushless motor assembly 12. The brushless motor assembly 12 includes a cover 121 located on its outer surface and a first mounting hole 122 located at its center. The fan blade assembly 13 includes a fixing member 133, and the fan blade 131 is spirally mounted on the fixing member 133. The longitudinal section of the fixing member 133 is U-shaped and the fixing member 133 is a hollow structure to form a sleeve portion 132 that can be sleeved on the brushless motor assembly 12. A second mounting hole 134 is also provided in the sleeve portion 132 to cooperate with the fixing portion 113 of the bracket 11. Specifically, the fan blade assembly 13 is sleeved on the cover 121 of the brushless motor assembly 12 through the sleeve portion 132, and the first mounting hole 122 in the brushless motor assembly 12 is installed on the fixing portion 113. One end of the fixing portion 113 protrudes out of the first mounting hole 122 to cooperate with the second mounting hole 134 of the fan blade assembly 13, so that the brushless motor assembly 12 and the fan blade assembly 13 are firmly mounted on the bracket 11 and form an integrated structure.

[0048] See also Figures 6 to 10 In some optional embodiments, the outer diameter of the mounting groove 112 for mounting the battery 31 is no larger than the outer diameter of the fixing member 133. It is understandable that when the fan blade assembly 13 rotates with the brushless motor assembly 12, the effective area for air supply is the annular area formed by the fan blade protruding from the fixing member 133. To prevent the mounting groove 112 from blocking the wind, the outer diameter of the mounting groove 112 is no larger than the outer diameter of the fixing member 133, so as to ensure the largest possible air supply volume. On the other hand, the gap between the fan blade 131 located on the fixing member 133 and the inner wall of the bracket 11 is less than or equal to 1 mm. The fan blade 131 is as close to the inner wall of the bracket 11 as possible without interfering with the interior of the bracket 11, so as to increase the wind pressure and the air supply volume.

[0049] See also Figure 6 、 Figure 7 、 Figure 13 and Figure 14In some optional embodiments, the circuit assembly 32 in the electrical structure 30 abuts against the battery 31, and the fixing frame 33 is sleeved on the circuit assembly 32 and installed at the end of the battery 31, so that the circuit assembly 32 and the battery 31 form an integrated structure through the fixing frame 33. A accommodating cavity 332 for accommodating the circuit assembly 32 is provided in the fixing frame 33. The circuit assembly 32 includes a circuit board 323 located in the accommodating cavity 332 of the fixing frame 33 and a first protrusion 324 and a second protrusion 325 protruding from the fixing frame 33. The first protrusion 324 is connected to the button 321, and the second protrusion 325 is connected to the charging port 322. The main structure of the circuit board 323 is located in the fixing frame 33, and only the first protrusion 324 and the second protrusion 325 connected to the button 321 and the charging port 322 are exposed outside the fixing frame 33. The button 321 and the charging port 322 are partially exposed outside the housing 20. The first protrusion 324 and the second protrusion 325 cooperate with the housing 20 to reinforce the installation of the circuit assembly 32 and the battery 31 in the housing 20. That is, the first protrusion 324 and the second protrusion 325 are connected to the housing 20 in the air duct 101 to provide auxiliary support, making the entire structure more stable. The button 321 and the charging port 322 are partially exposed outside the housing 20 for operation. For example, the circuit assembly 32 can be concave, rectangular, or L-shaped.

[0050] See also Figure 6 、 Figure 7 、 Figure 13 and Figure 14In some optional embodiments, grooves 333 are provided on both sides of the fixing frame 33 for positioning and installing the circuit assembly 32. The circuit assembly 32 is fixed in the grooves 333, and the first protrusion 324 and the second protrusion 325 protrude out of the fixing frame 33 through the grooves 333. As can be understood, the circuit assembly 32 is fixed to the fixing frame 33, and the fixing frame 33 is then mounted on the cylindrical battery 31, making the entire structure reasonable and compact. On the other hand, the fixing frame 33 is provided with a first engaging portion 331 that cooperates with the housing 20, and the housing 20 is provided with a second engaging portion 203 that cooperates with the first engaging portion 331. The cooperation between the first engaging portion 331 and the second engaging portion 203 strengthens the connection between the wind turbine structure 10 and the housing 20. A first engaging portion 331 and a groove 333 are provided on both sides of the fixing frame 33. The first engaging portion 331 and the groove 333 on the same side are approximately aligned longitudinally with respect to the fixing frame 33, thereby reducing wind resistance within the air duct 101. Since the first protrusion 324 and the second protrusion 325 in the circuit assembly 32 protrude out of the fixing frame 33 via the grooves 333 on either side, if the first engaging portion 331 and the groove 333 are positioned differently, obstructions in the circumferential direction of the air duct 101 will increase, thereby increasing wind resistance within the air duct 101 and reducing wind force. The first engaging portion 331 and the first protrusion 324 or the second protrusion 325 overlap within the air duct 101 along the length of the air duct 101 to minimize the placement of components within the air duct 101 and thereby reduce obstruction to the air duct 101. Since the first engaging portion 331 and the groove 333 are positioned approximately the same in the longitudinal direction of the fixing frame 33, the air duct 101 in other parts is unobstructed and the wind force is not significantly affected. The structural layout of the various components in the air duct 101 is reasonable, which maximizes the area of ​​the air duct 101 and reduces wind resistance.

[0051] See also Figure 11 and Figure 12In some optional embodiments, the housing 20 includes a first shell 21 and a second shell 22. Both the first shell 21 and the second shell 22 may be provided with a second engaging portion 203 that cooperates with the first engaging portion 331. The number of the first engaging portions 331 is the same as the number of the second engaging portions 203. The shapes and sizes of the plurality of first engaging portions 331 and the plurality of second engaging portions 203 may be different. It is understood that the first protrusions 324 and the second protrusions 325 on both sides of the circuit assembly 32 protruding from the fixing frame 33 can assist in supporting the fan structure 10 and the electrical structure 30. The fixing frame 33 then engages with the housing 20, making the installation of the air duct 101 assembly in the housing 20 more stable. At the same time, the main components of the circuit board 323 are integrated into the fixing frame 33, which can not only effectively protect the circuit board 323, but also reduce the number of structural components in the air duct 101, preventing the circuit board 323 from being directly placed in the air duct 101 and hindering air supply. The fan structure 10 of the present invention makes the area of ​​the air duct 101 larger, thereby greatly reducing wind resistance.

[0052] See also Figure 11 and Figure 12 In some optional embodiments, a mounting portion 201 that cooperates with the bracket 11 is provided in the housing 20, and the mounting portion 201 is recessed into the inner wall of the housing 20. The bracket 11 is snap-fitted and installed in the mounting portion 201, and the mounting portion 201 is used to reinforce the installation of the wind turbine structure 10 in the housing 20. The housing 20 includes a first shell 21 and a second shell 22, which are mounted together by a protrusion 212 and a hole 221, and then reinforced by a fixing ring 24. The mounting portion 201 is provided in the first shell 21 and the second shell 22, and the inner diameter of the mounting portion 201 is substantially the same as the outer diameter of the bracket 11, so that the entire wind turbine structure 10 is firmly installed in the housing 20.

[0053] See also Figures 1 to 4 and Figure 11 and Figure 12In some optional embodiments, an air inlet assembly 23 is provided at the end of the housing 20 near the bracket 11. The air inlet assembly 23 includes an air inlet cover 231 that is detachably mounted on the housing 20. A mating portion 202 that mates with the air inlet cover 231 is provided at the end of the housing 20. Specifically, a plurality of first air inlets 232 are provided on the air inlet cover 231, and the plurality of first air inlets 232 are provided on the side of the air inlet cover 231. The plurality of first air inlets 232 are in a grid shape, and the ratio of the height of the first air inlets 232 to the length of the fan blades 131 in the fan blade assembly 13 is greater than or equal to 0.9. The height of the first air inlets 232 is substantially the same as the length of the fan blades 131, so that the wind energy can be transmitted as much as possible. If the gap between the fan blades 131 and the housing 20 is too large, the amount of gas backflow will also increase, and the gas will circulate back and forth in the air cavity, which will easily accelerate the temperature rise of the fan structure 10. The air inlet cover 231 is also provided with a second air inlet 233, which is located on the bottom surface of the air inlet cover 231. The first air inlet 232 and the second air inlet 233 allow for more air to enter, thereby increasing the air volume. The minimum distance between the end of the first air inlet 232 closest to the fan assembly 13 and the fan assembly 13 is greater than or equal to 5 mm, i.e., the distance between the first air inlet 232 and the fan assembly 13 is not less than 5 mm. This ensures a better seal for the entire structure, prevents air leakage, and allows sufficient air volume to be delivered through the fan structure 10 while also reducing noise.

[0054] See also Figure 1 and Figure 11 In some optional embodiments, an annular air outlet 102 is provided at the end of the housing 20 away from the bracket 11. It can be understood that the fan blade assembly 13 includes a fixing member 133 and a plurality of fan blades provided on the fixing member 133. When the fan blades rotate, they form an annular air supply area with the fixing member 133. The ratio between the area of ​​the air outlet 102 and the air supply area ranges from 1:3 to 1:2. The air supply area of ​​the fan blade assembly 13 is larger than the air outlet area of ​​the air outlet 102, so that the air can be effectively compressed, the wind pressure can be increased, and the air supply distance of the fan can be increased. On the other hand, a number of boost guide vanes 211 are provided in the air outlet 102. The boost guide vanes 211 divide the air outlet 102 into a plurality of air outlet portions evenly and equidistantly. The provision of the boost guide vanes 211 can reduce wind resistance while increasing wind pressure and increasing the air supply distance.

[0055] like Figures 1 to 14As shown, the fan structure 10 of the present invention is suitable for a handheld fan. The fan structure 10 includes a bracket 11 and a brushless motor assembly 12 and a fan blade assembly 13 installed in the bracket 11. The end of the bracket 11 away from the fan blade assembly 13 is provided with a mounting groove 112 for installing a battery 31, and the battery 31 is a cylindrical battery 31. An electrical structure 30 that is integrated with the fan structure 10 is also provided in the air duct 101. The electrical structure 30 includes a cylindrical battery 31, a circuit assembly 32 and a fixing frame 33, and the circuit assembly 32 is fixed to the cylindrical battery 31 through the fixing frame 33. That is, the fan blade assembly 13, the brushless motor assembly 12, the bracket 11, the battery 31, the circuit assembly 32 and the fixing frame 33 are an integrated structure. The preset interval between the guide assembly 111 and the fan blade assembly 13 is between 1.5 mm and 2.5 mm, which can effectively reduce the fan blade noise and increase the air volume at the same time. The fan structure 10 is an integrated structure, which effectively integrates the various components of the fan structure 10, so that the area of ​​the air duct 101 is larger and the wind resistance is smaller. In the hidden blade handheld fan 100 of the present invention, the fan structure 10 and the shell 20 form the air duct 101. Since the fan structure 10 effectively integrates the various components, the area of ​​the air duct 101 is larger and the wind resistance is smaller. Among them, the circuit component 32 is fixed to the battery 31 through the fixing frame 33, and the circuit board 323 in the circuit component 32 is located in the fixing frame 33, that is, most of the circuit components of the handheld fan are integrated on the circuit board 323. The circuit board 323 is located in the fixing frame 33, which can effectively protect the circuit components and can minimize the exposure of the circuit components to the air duct 101, so that the wind force in the air duct 101 is maximized. The part of the circuit component 32 protruding from the shell 20 can play an auxiliary supporting role, making the overall structure more stable. On the other hand, the ratio of the height of the first air inlet 232 to the length of the blades in the fan blade assembly 13 is greater than or equal to 0.9, which can maintain a sufficiently large air intake. The minimum distance between the end of the first air inlet 232 close to the fan blade assembly 13 and the fan blade assembly 13 is greater than or equal to 5 mm, which can reduce noise. The ratio between the area of ​​the air outlet 102 and the air supply area ranges from 1:3 to 1:2 to effectively compress the air and increase the wind pressure. Several boost guide vanes 211 are provided in the air outlet 102 to increase the wind pressure and increase the air supply distance. The hidden blade handheld fan 100 of the present invention can effectively increase the area of ​​the air duct 101, increase the air intake, reduce noise and increase the overall air output, and provide a better user experience.

[0056] The above disclosure is only a preferred embodiment of the present invention and cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are within the scope of the present invention.

Claims

1. A fan structure suitable for a handheld fan, characterized in that: include: A bracket, the bracket being arranged in the fan structure, the bracket being provided with a hollow cavity; a fan blade assembly, the fan blade assembly being disposed in the hollow cavity; A brushless motor assembly, wherein the brushless motor is also disposed in the hollow cavity, and the brushless motor assembly and the fan blade assembly are connected via a connecting assembly; The guide assembly is arranged in the bracket, and the guide assembly and the fan blade assembly are arranged at a preset interval. When the fan structure is started, a circulation will be generated between the guide assembly and the fan blade assembly to form pressure potential energy.

2. The fan structure according to claim 1, characterized in that: The fan structure further includes an air inlet assembly, and the flow guide assembly is further away from the air inlet assembly than the fan blade assembly.

3. The fan structure according to claim 1, wherein: The guide assembly includes a plurality of guide blades, and the fan blade assembly includes a plurality of fan blades. The spiral directions of the guide blades and the fan blades are opposite.

4. The fan structure according to claim 3, characterized in that: The guide blades and the fan blades are located in the hollow cavity.

5. The fan structure according to claim 4, characterized in that: The gap between the fan blade and the inner wall of the bracket is less than or equal to 1 mm.

6. The fan structure according to claim 1, characterized in that: The preset interval between the guide assembly and the fan blade assembly is between 1.5 mm and 2.5 mm.

7. The fan structure according to claim 1, characterized in that: The fan blade assembly is sleeved on the brushless motor assembly.

8. The fan structure according to claim 1, characterized in that: An installation groove is provided at one end of the bracket away from the fan blade assembly, and the guide assembly is arranged on the outer side wall of the installation groove.

9. The fan structure according to claim 1, characterized in that: The brushless motor assembly, the fan blade assembly and the flow guide assembly are coaxially arranged.

10. A handheld fan with hidden blades, comprising a housing, characterized in that: It also includes the fan structure according to any one of claims 1 to 9, wherein the fan structure is installed in the shell, and the outer surface of the fan structure and the inner surface of the shell form an air duct for supplying air.

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